Can the PLC control cabinet of a chemical plant be placed in the electrical distribution room? Regulations regarding the placement of control cabinets in electrical distribution rooms, although specifically for fire pump control cabinets: Compliance conditions: According to the "Code for Fire Protection Design of Buildings," the power distribution lines for firefighting equipment should be set up independently, and control equipment should preferably be located in the fire control room or a dedicated electrical distribution room. However, if the electrical distribution room meets the following conditions, control cabinets may be temporarily placed there: Fire separation: The electrical distribution room and adjacent areas must use fire-resistant partitions with a fire resistance rating of ≥2 hours and Class A fire doors. Environmental requirements: Temperature ≤40°C, humidity ≤85%, and no corrosive gases. Safety distance: The distance between the control cabinet and the distribution cabinet should be ≥1.5 meters to avoid electromagnetic interference. Exceptions: If the electrical distribution room also stores non-firefighting equipment (such as ordinary power cabinets), an additional fire compartment must be added, and the fire control cabinet should be separately zoned and clearly marked.
1. Ambient temperature: The operating ambient temperature for the PLC control cabinet is related to the temperature tolerance of its components, typically within the range of 5°C to 40°C. 2. Ambient humidity: The installation environment of the cabinet should be as dry as possible; the maximum allowable relative humidity in the operating environment is 95%, with no condensation. 3. Ambient atmospheric pressure: The atmospheric pressure of the cabinet installation environment must be between 1080 and 795 hPa (equivalent to an altitude of -1000 to 2000 meters). 4. Special pollutants in the operating environment: When the cabinet operates in a specially polluted environment, it must meet the following standards: SO2: <0.5 ppm; H2S: <0.1 ppm; RH: <60%; and no condensation. When the control cabinet is affected by environmental conditions during use, the following measures can be taken: In high-temperature conditions: ① Natural air cooling (relying on natural ventilation through louvers at the top and bottom of the cabinet) When installing inside the cabinet, it is preferable not to use cooling devices such as fans or air conditioners. ② Forced ventilation (relying on fans at the top of the cabinet for forced ventilation)
③ Forced circulation (relying on fans inside a sealed cabinet for forced circulation ventilation) ④ Room-wide cooling (using air conditioning to cool the entire room where the control cabinet is placed). In cases of atmospheric environmental impact: Use in the following locations may cause poor connector contact and corrosion of components and parts, making it necessary to take measures such as air purification. ① In locations with a lot of dust, iron powder, or floating oil fumes and organic solvents, use a large sealed control cabinet where the internal temperature does not rise significantly. ② Especially in locations with corrosive gases, perform air cleaning (air purification) of the control cabinet and slightly pressurize the cabinet to prevent the entry of external corrosive gases. ③ In locations with flammable gases, the PLC control cabinet may become an ignition source. Explosion-proof equipment can be installed, or it should not be used in such locations.